OWA is used to access e-mail, calendars, contacts, tasks, and other mailbox content when access to the Microsoft Outlook desktop application is unavailable. Microsoft provides Outlook Web Access as part of Exchange Server to allow users to connect remotely via a web browser. Some of the functionality in Outlook is also available in this web ‘look-alike’. The most important difference is that Microsoft Outlook allows users to work with e-mail, calendars, etc., even when a network connection is unavailable, whereas OWA requires a network connection to function. OWA can be used from Internet cafes and any other location that provides connectivity to the Web.
If you would like to connect to OWA, you can do so from any browser by navigating to https://outlook.office.com